William c



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NAFETERS, PNOTO-LITHOGRAPHER, WASHINGTON, D C,

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Letters Patent No. 78,183, dated May 26, 1868.

IMPEOVED HAND-DRILL.

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TO ALL PERSONS TO WHOM THESE PRESENTS MAY COME:

Be it known that I, WILLIAM C. BURCH, of Gloucester, in thecounty of Camfden, and State of New Jersey,- have made a new and useful invention, having reference to Hand-Drills, or what are termed Drill-Stocks, tc.;

and I do hereby declare the sanne to be fully described in Vthe followingspeciication, and represented in the accompanying drawings, of which- Figure 1 is a 'side elevation, and Y Figure 2 avertical section of a hand-drill provided'with my improvement.

Figure 3 is a side view of its helical brake.

It is well known that the shank or shaft of abend-drill, when in use, 1s usually revolved by a hand-lever carrying one or-inore navals to act against a ratchet xed to the said shaft.

I dispense with such pas/l and ratchet, and employ a helical brake in. lieu thereof, whereby I am enabled to attain certain important advantages: first, I save the-usual noise ofthe pawl produced by its'slippiug over the teeth of the ratchet; second, I avoid back slip of the lever, and bringr gradually upon the drill and its shaft the strain of the force applied through the lever to revolve the shaft. I thereby render the drill less liable to be broken, i

and I also save the wrist and hand of the user from the effects of jars or oncussionsdue to sudden stoppage of the lever, such resulting in the bringing up of a pawbagainst the teeth of a ratchelg'when such lever is used .Y

with a pawl and ratchet.

In the drawings, A denotes the drill-shaft, carrying a drill, d, at its lower end,'and having a feeding-screw,

a, screwed into its other or upper end,l such feeding-screw being provided with a conical pivot, c. i

This shaft goes axially through a. cylinder or t'ubular'hcad, B, fromwhose middle a handle or lever, C, is extended. The said head rests on a shoulder, e, formed on the shaft, and where the shaft projects above the upper end of the-head, itis encompassed by a ring orlcollar, D, held to itby alset-scremf.

VWithin the bore of thel head B4 is a helix or helical-spring or brake, E, which encompassesthe drill-shaft and its toit. At its lower end or part the said brake is connected with the head so as to revolve with it, the connection being by means of a. pin, g, going into the head and lower part of the brake.

By imparting to the lever a reciprocating motion, so as lto turn the head part back and next forward, the

helical brake will be moved with the head and about the drill-shaft, while the headfmaybe in the act of being i i turned back, but while the hea'd may be in the act of being turned forward, the helical brake will be drawn and contracted upon the shaft, and will hold it so tightly as to cause it tol-evolve forwardwith the head, and thus turn the drill. 4

I claim the combination and arrangement of the helical brake with the drill-shaft and the head of the operative lever, the whole being to operate substantially as described.

WILLIAM c. BEECH.

Witnesses HENRY FowLEn, WILLIAM AMES. 

